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STEAM CONEEOLLING DEVICE. No. 412,804. Patented Oet. l5, 1,889.

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STEAM UONTEOLLING DEVICE. No.1412,804. Patented Oct. l5, 1889.

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.109m V y 75 UNITED STATES PATENT CEEICE.

RICHARD SMITH, OF SHERBROOKE, QUEBEC, CANADA.

STEAM-CONTROLLING DEVICE.

SPECIFICATION forming part of Letters Patent No. 412,804, dated October 15, 1889. Application filed September 14, 1888- Serial No. 285,399. (No model.)

To all whom. t may concern.-

Beit known that I, RICHARD SMITH, a citizen of the Dominion of Canada, residing` at Sherbrooke, in the county of Sherbrooke and Province of Quebec, Canada, have invented certain new and useful Improvements in Steam-Controlling Devices; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or gures of reference marked thereon, which form a part of this specification.

This invention relates to valves employed in controlling a supply of exhaust-steam to any desired source-as, for instance, to driers forming part of a paper-makin g machine. In some instances at short intervals such supply of steam does not suffice.

The object of my invention is to obviate this diihoulty and always insure a suitable su pply. To this end I have combined with the valve which controls the exhaust-stean'l a second or auxiliary live-steam valve. The latter is operated by the exhaust-steam valve, and is connected therewith in such manner that when the exhaust-steam valve has nearly reached the position of being` wide open the mechanism operated by said Valve has automatically opened the live-steam valve at that time. In this way an additional supply of steam may be added, and thus always insures a proper supply to the desired place, either in the form of all exhaust or part exhaust and part live steam, as will be fully hereinafter set forth.

Figure 1 represents a vertical central section of a valve embodying my improvements. Fig. 2 represents the same'open and applied to and controlled by a spring-mounted roll adapted for paper-making machines.

In said drawings, 2 represents a valve-case formed with a supply-opening` 3, to connect with the exhaust-steam, and a delivery-opening 4, which connects by suitable piping with the source to be supplied. A balanced valve 5, of the class termed double piston-valves, operates within apertures G 6, formed in the internal partition 7, to control the supply of exhaust-steam to the desired point of delivery. The stem 8 of the valve reciprocates within the adjustable glands 9 which a'ct not only as guides, but further control the distance said valve is to move. Thus it will become evident that with this arrangement, in the event of the exhaust-steam not heilig suiicient to supply the demand, no serious or harmful results can occur, since I obviate this difficulty as follows: A secondary chamber 10 is formed by means of the partition 12, and located therein is an auxiliary balance-valve 13, smaller but of the same construction as that of the valve 5. Said valve 13 controls the passage of live steam, which enters through the pipe 14 in the auxiliary inlet supply-passage 3. YIo render this livesteam or auxiliary valve 13 dependent in its operation upon the exhaust-steam or main supply valve 5, I have united the stems 8 and 15 of said valves by a connecting lever-rod 16, pivoted to the valve-case at 17. Furthermore, the adjustment of the valve 5 is such that a very slight movement will open it. Conversely, the auxiliary valve 13 is permitted considerable travel before opening, since this valve is normally inoperative and is opened only at such times when the supply ot' steam through the inlet-opening 3 is not suflicient. Thus the lever-rod 16, pivoted to the valve-case, is constantly operated by the movement of the main valve 5 in regulating the supply of steam to the deliverypipe 19. The shape and adjustment of this lever-rod which connects the two valves are suoli that the main valve can open, operate this lever-rod, and likewise the auxiliary valve 13, while the latter continues normally closed. Thus it is seen that simultaneous movement of the valve 13 is produced with any movement of the main valve 5, which latter does not open the auxiliary valve until the full supply of steam is being drawn through the supply-opening 3. At that time, and when the valve 5 is wide open, or very nearly so, the auxiliary valve is opened and an additional volume of live steam is permitted to enter and join the exhaust-steam passing through the delivery-pipe. As soon as the demand ceases or the supply of exhaust-steam is increased, the valve 5, which controls the admission of exhaust-steam, is again operated, thereby closing the valve 13 either partially or entirely, as circumstances demand..

IOO

To prevent any retarding action which might result Jfrom the inilow of the live steam into the valve-chamber, a pipe 18, which enters within the pipe 19, connects the latter with the chamber 10. In this way suction is induced after the manner of injectors and the flow of exhaust-steam is rather accelerated than retarded.

The operation of this valve is shown in Fig. 2 in connection with a spring-roll mounted upon a paper-making machine. The endless web of paper passes over and above the said roll. It is evident the tension of the paper is more or less according to the amount of moisture in it, and the valve is intended to be controlled by such tension. Therefore, if the paper is too much dried the valve is admitting steam in excess of the amount required for the proper drying of the paper, and the result is to increase the pressure downward upon the roll, compress the spring,

' and partially or entirely close the valves, one

shell provided with a main supply-opening, a delivery or discharge opening, and a main valve which controls said supply-opening, combined with an auxiliary inlet supplyopening and its controlling-valve connected With and actuated by the main valve by means of a connecting-lever pivoted near its center, substantially as and for purposes stated.

2. In valve-cases provided with two inlet supply-openings and a common delivery-opening, an adjustable valve 5 and the adgustable glands 9, combined with the secondary valve which governs the secondary inlet-opening and the interconnecting lever by which the main valve causes the auxiliary valve to open, substantially for purposes stated. a

3. In combination, the valve-case 2, having` the inlet supply-openings 3 3', the valves o 13, which respectively control said openings, and the lever-rod 16, pivoted to the valvecase and operated by the main valve 3'to open the valve 13, and the pipe 18, which connects the chamber with the discharge, substantially for purposes herein set forth.'

In testimony whereof I affix my signature in presence of two witnesses.

RICHARD SMITH.

Vitnesses:

H. E. LODGE, FRANCIS C. STANwooD. 

